ML17275A813

Interim Deficiency Rept Re Design Basis for Pipe Whip Supports Inside Containment on High Energy Lines Containing Check Valve or Normally Closed Valve.Extent of Pipe Whip Due to Jet Impingement Will Be Analyzed.Next Rept by 810630

ML17275A813
Person / Time
Site:	Columbia
Issue date:	01/29/1981
From:	Matlock R WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
10CFR-050.55E, 10CFR-50.55E, GO2-81-18, NUDOCS 8102030450
Download: ML17275A813 (6)

Text

REGULATORY INFORMATION DISTRIBUTION S 'TEM (RIDS)

ACCESSION NBR:8102030450 DOC ~ DATEt 81/01/29 NOTARIZED: NO DOCKET BYNAME FACIL:50 397 NPPSS Nuclear ProJecti Unit 2P Nashington Public Powe 05000397 AUTH AUTHOR AFFILIATION MATLOCK<R.G, 'j<ashington Public Power Supply System REC IP ~ NAME. RECIPIENT AFFILIATION ENGELKEN g R ~ H ~ Region 5r San Francisco'ffice of the Director

SUBJECT:

. Interim deficiency rept re design basis for pipe whip supports inside containment on high energy lines containing check valve or normally closed valve. Extent of pipe whip due to Jet impingement will be'-'nalyzed, Next rept by 810630.

DISTRIBUTION CODE! B019S . COPIES RECEIVED:LTR ENCL SIZE:

TITLE; Construction Deficiency Report (10CFR50.5SE)

NOTES:PM; 2 copies of all material. 05000397 RECIPIENT'D COPIES RECIPIENT COPIES CODE/NAME, LTTR ENCL ID CODE/NAME LTTR ENCL" ACTIONS. A/D LICENSNG 04 1 1 YOUNGBLOODPB 05 1 1 RUSHBROOKPM ~ 1 LYNCHeD ~ 07 1 1 ~

AD/RC I/IE i 06'NTERNAl!

17 1- 1 ASLBP/J ~ HARD 1 1 D/DIR'UM FAC15A 1 DIRP DIV OF LIC 1 1 EDO 8 STAFF 19 1 1 EQUIP QUAL BR11 1 1.

HYD/GEO BR 1 1 ILE 09 1 1

?0 22'IC QUAL BR 1 1 MPA 1 1 PDR 02" 12'RC

.1 1 OELD 21 1 1-REV 13 1 QA BR 14 1 1 RE FI 01 -

1 RUTHERFORDPH ~ IE 1 1 DRDS DEV 21 ~

1 1 EXTERNAL: ACRS 16 16 16 LPDR 03 1 1 NSIC 08 1

~EB 04 198t TOTAL NUMBER OF COPIES REQUIRED'TTR ~ ENCL MF

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Washington Public Power Supply System A JOINT OPERATING AGENCY P.O. BOX 968 3000 GEO. WASHINGTON WAY RICHLANO, WASHINGTON 99352 PHONE (509),372.5000 January 29, 1981 Docket No. 50-397 G02-81-18 CPPR-93 Nuclear Regulatory Commission Region V Suite 202, Walnut Creek Plaza 1990 North California Blvd.

Walnut Creek, California 94596 Attention: Mr. R. H. Engelken, Director Gentlemen:

Subject:

WPPSS Nuclear Project No. 2 Potentially Reportable Deficiency - 10CFR50.55(e)

Design Basis for Pipe Whip Supports Inside Containment Your staff was previously informed by telephone on December 29, 1980, of a potentially reportable 10CFR50.55(e) condition regarding the design basis for pipe whip supports inside containment on high energy lines containing a check valve or normally closed valve. Attached please find the WNP-2 Project s Interim Report which identifies the approach that is being taken to resolve this condition.

An updated report on this condition will be submitted on June 30, 1981.

At that time, the majority of the analysis should be complete. A final report will be issued when the analysis is finished and an evaluation of the resulting safety significance is completed.

~Please contact us if you have additional questions.

Very truly yours, CDt))~

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) R. G. Matlock

'<<J. Program Director, WNP-2

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- Burns B Roe Stello ~RC, Director IBE

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- NRC Resident Inspector Branch'D Toth B. Wood - NUS Corporation WS Chin - Bonneville Power Admin.

WNP-2 Files 8>02030< RE Snaith - B&R

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WASHINGTON PUBLIC POWER SUPPLY SYSTEM DOCKET NO. 50-397 LICENSE NO. CPPR-93 INTERIM REPORT POTENTIALLY REPORTABLE CONDITION WPPSS NUCLEAR PROJECT NO. 2 DESIGN BASIS FOR PIPE WHIP SUPPORTS INSIDE CONTAINMENT Statement of Problem The jet impingement forces that could act on a section of pipe downstream of a postulated pipe break which contains a check valve or normally closed valve were not considered when pipe whip supports were designed inside containment. The downstream pipe section could whip, causing damage to safety related equipment. This damage, when combined with a single active component failure, could prevent safe opera'tion or shutdown.

Pro osed A roach to Resolution: The Architect-Engineer wi11 provide the Supply System with the locations of all high energy lines inside containment that contain check valves or normally closed valves. The Supply System will continue analysis of postulated pipe ruptures, concentrating on those systems identified above. The extent and effect of pipe whip due to jet impingement at each location identified above will be analyzed. Supply System Field Engineering is currently pro-viding a field inspection of potential problem areas to supplement the analysis. Additional pipe whip supports will be provided where the analysis indicates pipe whip cannot be tolerated.

An updated report on this condition will be submitted on June 30, 1981.

At that time, the majority of the analysis should be complete. A final report will be issued when the analysis is finished and an evaluation of the resulting safety significance is completed.

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